Subject: Re: [RFC PATCH 9/9] dt-bindings: net: dsa: Add documentation for Hellcreek switches

From: Kurt Kanzenbach <[email-masked]>
Date: Fri, 19 Jun 2020 10:47:43 +0200

Hi Andrew,

On Thu Jun 18 2020, Andrew Lunn wrote:
>> +Ethernet switch connected memory mapped to the host, CPU port wired to gmac0:
>> +
>> +soc {
>> +        switch0: switch@0xff240000 {
>> +                compatible = "hirschmann,hellcreek";
>> +                status = "okay";
>> +                reg = <0xff240000 0x1000   /* TSN base */
>> +                       0xff250000 0x1000>; /* PTP base */
>> +                dsa,member = <0 0>;
>> +
>> +                ports {
>> +                        #address-cells = <1>;
>> +                        #size-cells = <0>;
>> +
>> +                        port@0 {
>> +                                reg = <0>;
>> +                                label = "cpu";
>> +                                ethernet = <&gmac0>;
>> +                        };
>> +
>> +                        port@2 {
>> +                                reg = <2>;
>> +                                label = "lan0";
>> +                                phy-handle = <&phy1>;
>> +                        };
>> +
>> +                        port@3 {
>> +                                reg = <3>;
>> +                                label = "lan1";
>> +                                phy-handle = <&phy2>;
>> +                        };
>> +                };
>> +        };
>> +};
>> +
>> +&gmac0 {
>> +        status = "okay";
>> +        phy-mode = "mii";
>> +
>> +        fixed-link {
>> +                speed = <100>;
>> +                full-duplex;
>
> Hi Kurt
>
> The switch is 100/100Mbps right? The MAC is only Fast ethernet. Do you
> need some properties in the port@0 node to tell the switch to only use
> 100Mbps? I would expect it to default to 1G. Not looked at the code
> yet...

No, that is not needed. That is a hardware configuration and AFAIK
cannot be changed at run time.

Thanks,
Kurt